NT21_Reference Manual (V069-E1-1) (986756), страница 81
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Two example applications are described below.1. Automatic Transferand Execution of ScreenData for MaintenanceA maintenance program can be executed in the host to automatically write andstart screen data for maintenance in the PT.PTHosta) Operating withmemory linkMENUSETMON.c) Screen data transferd) Start operationwith maintenancescreen data.MAINTENANCEb) Execute maintenanceprogram.Tank ATank BTank CTank DBulb ABulb BBulb C401SectionMemory Link Online Transfer Function4-42. Automatically SwitchThe PT’s screen data can be changed at the scheduled times each day to disPT Screen Data atplay the regular operating screen or maintenance screen.Certain Times8 AM Screen ChangePTHostb) Start regularoperation withmemory link.MENUSETMON.a) Transfer regularoperating screen data.6 PM Screen ChangePTb) Start operationwith maintenancescreen data.HostMAINTENANCETank ATank BTank CTank DBulb ABulb BBulb Ca) Transfer maintenancescreen data.402SECTION 5Function ApplicationsThis section presents a collection of simple practical examples that will give you hints on how to make best use of the functionsof the PT.Please use these examples for reference when using the PT.5-15-2Examples of Actual Applications of Direct Access .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Examples of Actual Applications of Memory Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .404417403SectionExamples of Actual Applications of Direct Access5-15-1Examples of Actual Applications of Direct AccessSome examples that will give you an idea of how to actually apply the functionsof the PT such as those indicated below are presented here.• Continually monitoring a specific PC bit and displaying an alarm when it comesON ...... page 404• Changing display contents in accordance with PC bit status ..... page 408• Displaying online help with a touch switch .....
page 410• Continually monitoring a specific PC bit and displaying a message on a window when it comes ON ..... page 411• Continuously reading out the contents of a PC word and displaying a trendgraph by backtracking ..... page 412• Displaying the day of the week using the clock data in the PT ..... page 414• Enabling and disabling a touch switch with an interlock bit ....
page 415• Scaling the contents of a PC word and displaying the result..... page 416In these examples, only the necessary settings are shown. Make the unspecified settings according to your requirements. In some of the examples, colorsother than black and white are used for the display colors; note that these examples can be applied even with monochrome type PTs, for example by setting thedisplay of black and white in reverse video.For the method for creating screens with the Support Tool, refer to the NT-SeriesSupport Tool Version 4.6 for Windows Operation Manual (V061-E1-j).Continually Monitoring a Specific PC Bit and Displaying an Alarm When It Comes ONDisplaying TEMPERATURE ABNORMAL in red, regardless of the screen currently displayed, when the monitored bit at the PC comes ON.Example:PTTEMPERATUREABNORMALPCONBit1Alarm list1, 2, 3...4041.
Set TEMPERATURE ABNORMAL as the initial value for any characterstring memory table entry.2. Make the following settings for any bit memory table entry.• PC Address:PC bit number to be monitored• Function:Alarm• String table entry: Number of the character string memory table entry forwhich settings were made in (1).3. Register an alarm list, set as indicated below, for any screen.• Color setting, Frame:Black (same as the background color of other screens)• Color setting, Background, ON:Red• List Settings:Set the Start Bit Table Entry and No. of Bits Referenced so as to include thebit memory table entry set in (2) above.4. Set overlapping screens so that all screens displayed on the PT are overlapped by the screen created in (3).SectionExamples of Actual Applications of Direct Access5-1Suggestions• In order to display TEMPERATURE ABNORMAL with no frame, make itsbackground color the same as that of other screens (Alarm List, page 182).• So that TEMPERATURE ABNORMAL is displayed regardless of which screenis currently displayed, display the overlapping screens created in (4) at the PT(Overlapping Screens, page 42).• As an alternative to making every screen an overlapping screen, the same result can be achieved by registering an alarm list on every screen.• The same kind of display can be displayed even though ON/OFF switchingguide characters are set for a normal lamp (Normal (Standard) Lamps, page112).Displaying a screen with TEMPERATURE ABNORMAL in black on a red background when the monitored PC bit comes ON.Example:PTPCONBit1Screen switchedTEMPERATUREABNORMAL1, 2, 3...1.
Set the properties of the screen displayed when the bit comes ON as follows:• Background color:Red2. Register a fixed display text element for the screen set in (1) as follows:• Text:TEMPERATURE ABNORMAL• Foreground Color:Black• Background color:Transparent3. Make the following settings for any bit memory table entry.• PC Address:Number of the PC bit to be monitored• Function:Switch screen• Screen No.:Number of the screen set in (1) and (2)Suggestions• In this method, after switching to the error screen, the error screen remains displayed even if the status of the monitored PC bit changes back from ON to OFF(2-3-3 Bit Memory Table, page 83).
After checking the error at the equipment,one of the following methods must be used to return to the screen that was displayed before the error occurred: using a touch switch with the switch screenfunction (page 131), writing a screen number to the control area (page 53), orswitching the screen by using a bit memory table entry (page 83).405SectionExamples of Actual Applications of Direct AccessExample:5-1Displaying a screen that shows details of the error when the TEMPERATUREABNORMAL alarm message is pressed.PT192_C 165_C 183_CTEMPERATUREABNORMAL250_C 180_C 175_CError location displayed in redAlarm list1, 2, 3...1.
Set TEMPERATURE ABNORMAL as the initial value for any characterstring memory table entry.2. Make the following settings for any bit memory table entry.• PC Address:PC bit number to be monitored• Function:Alarm• Switch screen:Check mark set• Screen No.:Number of the screen that displays details of the error (refer to (4))• String table entry:Number of the character string memory table entry for which settings weremade in (1).3. Register an alarm list, set as indicated below, for any screen.• Color setting, Background, ON:Red• List Settings:Set the Start Bit Table Entry and No.
of Bits Referenced so as to include thebit memory table entry set in (2) above.4. Register the following elements on the screen that displays the error details.Numeral displays that display the temperature in each part_C_C_C_C_C_CImage/library lamp corresponding to each part(When the bit that indicates the error location comes ON,the corresponding image/library lamp lights in red.)Suggestions• The ladder program must be written so that at the same time as the bit that indicates the temperature error comes ON, the bit that indicates the error locationfor the relevant temperature also comes ON.406SectionExamples of Actual Applications of Direct AccessExample:5-1Displaying a screen with details of the times at which alarms occurred in the pastwhen the TEMPERATURE ABNORMAL alarm message is pressed.PTTEMPERATURE ABNORMAL 13:12TEMPERATUREABNORMALCONVEYOR STOPPED11:47PROCESS 3 STOPPED11:23Alarm list1, 2, 3...Alarm history1.
Set TEMPERATURE ABNORMAL as the initial value for any characterstring memory table entry.2. Make the following settings for any bit memory table entry.• PC Address:PC bit number to be monitored• Function:Alarm• History:Check mark set• Switch screen:Check mark set• Screen No.:Number of the screen that displays the alarm history (refer to (4))• String table entry:Number of the character string memory table entry for which settings weremade in (1).3. Register an alarm list, set as indicated below, for any screen.• Color setting, Background, ON:Red• List Settings:Set the Start Bit Table Entry and No. of Bits Referenced so as to include thebit memory table entry set in (2) above.4.
Register the set alarm history as follows on the screen that displays thealarm history:• History Info:Check mark set• Order type:Order of occurrenceSuggestions• When designating the screen number with a bit memory table entry, the alarmhistory can also be displayed by designating the following screen numbers.• No.
9001: Occurrence History Screen (page 244)• No. 9002: Frequency History Screen (page 244)In this case, there is no need to register an alarm list.407SectionExamples of Actual Applications of Direct AccessExample:5-1Displaying the corrective action (help information) when the alarm messageTEMPERATURE ABNORMAL is pressed.PTLibrary data!TEMPERATUREABNORMALInspect ...TEMPERATUREABNORMALAlarm list1, 2, 3...1. Set TEMPERATURE ABNORMAL as the initial value for any characterstring memory table entry.2.
Create library data, registering for it a fixed display text element in which thecorrective action for the temperature alarm (for example Inspect ...) is written.3. Make the following settings for any bit memory table entry.• PC Address:PC bit number to be monitored• Function:Alarm• String table entry:Number of the character string memory table entry for which settings weremade in (1)• Image/library code:Check mark set, code of the library data created in (2)4.
Register an alarm list, set as indicated below, for any screen.• Color setting, Background, ON:Red• Display ImageLib:Check mark set• List Settings:Set the Start Bit Table Number and No. of Bits Referenced so as to includethe bit memory table entry set in (3) above.Changing Display Contents in Accordance with PC Bit StatusExample:Changing the status of a graphic depicting the opening and closing of a valve inaccordance with the status of one PC bit.PTPCOFF stateBitON/OFF0 OFF1 ONON state408SectionExamples of Actual Applications of Direct Access1, 2, 3...5-11.
Create figures depicting the valve when open (A in the figure below) and thevalve when closed (B in the figure below), either by using library data (fixeddisplay graphic) or image data (comprised of dots).AB2. Register image/library data set as indicated below for the screen.• OFF State, Code:Check mark set, code of the figure depicting the closed valve created in (1)• ON State, Code:Check mark set, code of the figure depicting the open valve created in (1)• PC Address:Number of the bit used to change between the figuresExample:When the displayed character string is changed in accordance with the status ofone PC bitPTTRANSPORTINGPCOFF stateBit0 OFFON/OFF1 ONTRANSPORTOVERON stateRegister a normal lamp for the screen with the following settings.• Guide character type: ON/OFF switching• OFF guide characters: TRANSPORTING• ON guide characters: TRANSPORT OVER• PC address:Bit address of the bit used to change between thecharacter stringsExample:PC bits 0 to 15 come ON according to the position of an automatic guided vehicle, and the position of the vehicle is shown on the screen.PTPCAutomatic guided vehicleat bit 0 position150 BitsAutomatic guided vehicleat bit 1 position409SectionExamples of Actual Applications of Direct Access1, 2, 3...5-11.
Create figures depicting the automatic guided vehicle with library data (fixeddisplay graphics) or image data (composed of dots). If there is a figure with adifferent orientation, create it separately.2. Register image/library lamp set as shown below for the position corresponding to bit 0 on the screen.• OFF State, Code:Check mark not set• ON State, Code:Check mark set, code for the library data for the automatic guided vehiclecreated in (1) (shape corresponding to the position)• PC Address:Bit number of bit 0 indicating the automatic guided vehicle’s position3.
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